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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a25004e8c4bb477ec3820058cd19144346734d016dfc7e44a226306d27c1473' 
  AND token = 'kAXASUrvBKml6pfZ6XHDHN0kbmC53HsUInlPRQeVlXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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