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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb1d0570787e55f828f09b3a8562c78ca2bd1f54bfd3bbd8528b76570db1122' 
  AND token = 'xYTTOLEsfWA78CGK3IPt2Uf62rY/vDC1CWiam9DAm+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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