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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3fa6d26f8d9535a4e76f7d2d82a2023177bba7cd2c9e325482ace74fc917bb' 
  AND token = 'HIpwNz9k3Ph3qiMaJ5ube7l0pkYVBUt4T5RlJX6p4qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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