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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027795d247f814b98c46e6b1ae788849a599e6ac7ec6a4882e82f3fd3b9a644d' 
  AND token = 'Oq9W8QO6lFNjgYpj9EoT7TKF6vJOS03lxS1BcGmdZPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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