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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88824f4620fbf3b4d5965f1f8597c387e290253fd067d78206280aedc4a0d6f' 
  AND token = 'NPOCVEzfMPxf3Cwm4I1AVeLol8GRlSD8ohiVQfvKO4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}