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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c693384f3446e3151a98affd52670a31c1ccfed0ead25eedff29874f1e502469' 
  AND token = 'Ff33PF6c7pJ74CXhLeF2I7I9iegjU8zbM9ZGZ4hjSU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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