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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7231ff40acd9beb39dc918e455c2ba4d2d5be0c6b3bbf62bbbe1eb7cc1023821' 
  AND token = 'n6llpvYGkuUlgQd7KdftlOIVCQrBzfMQyYHJBFC/OnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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