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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9955e3bf25beb5d70a65dc2016811ae2d3a38afe3ee518e3bfd82b768acc61fa' 
  AND token = '4dEu6WY6Vyg94ZfwJynqzgkOxMQUiQGuCgt3hhGAIOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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