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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2903a240b0ea42ea29c865b8f7c09ada6eb7ed70e795e7fe5df186fcde1b51a' 
  AND token = '7OTh1Wz5XsncKU+8xe12SVQ8pk7Ai+HKzK+qzB+acy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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