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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb92225ca8d1a6b4106602bd4427f31ef9c00f25518c073a0e4a6ff4bd2dd5ff' 
  AND token = 'YUAIAiUWLWN4UifJ3loM48Z12NlJpeKSlkqBOTrTob4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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