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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4f96cbb305ecfc8d59448b98cc0a2e05aa6e49c7883f5ffb7321d06bf4252f' 
  AND token = 'J7hZ7keAN0BAZgj4sfwVzxhegvLeEDxA1s2T1ztsqH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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