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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9096ad8cae1ed64a98a93a3e8e9aabfa5006c8049e9162c4d5dd2e8cdb42493e' 
  AND token = 'nKQmR9WrOcOK7501vDk2kcPQbI84z5o8n8Xeok9pOE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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