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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883d9d1abfbbddf4a1f21ed4d3f62753e70809f68bf7941a7b85e7b21a8543d3' 
  AND token = 'FbS0lAijx2Do0fFPLAqRyjbsIXtrckzU04YKnqTFk/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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