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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb054ae1ad3a613e2d2347ef7c9f72f329ebfc302f59e374dcee728910217c53' 
  AND token = 'yheV5GPDCB3L+dThS5tip6lNdql3vNMEVD0OU5DD85s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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