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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f22a4834e8ffb8c9d80ee9ca8d1f3a04ed5c091e3c8e4bea07b3396a5f1452b' 
  AND token = 'sgPVklp3B3nhQkXAx8hMp5WwQ1DvBFi+rSg3il61V3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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