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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd388fe63d24d2aef62c8d691082cd05f9b2f8ed8ad65310d987bfadc3d6f0f1' 
  AND token = 'DEBaJ0sL8sUx58RiAd3gk8iKkybHkH4bVOAhrHMy6O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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