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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984927a6f6f30cddfb66ccbc83d0ede2f802d1fb2c67d9a1552fe3a0c25fff75' 
  AND token = '+YoaQ5JZATlziyTTjhIsvftS55RaroMigVJRUuxkSG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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