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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ffa499d85b7e6276c90ebbf0d4ddeff69811450e71583e3f0dcdc900d9c9ff' 
  AND token = '7Sw0Cps2dcI6b04lUOc6FKgJiB3huQNL0x0XoD8jGwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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