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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503a18d93791cac405f5cbc86d42cb73fa1e23b683a4d7380d708bbcfcc876e7' 
  AND token = 'iEbFBjMLeQGoeWEa5i06/g3Cv2QtzOqYLU6PFDNVBHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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