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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b336d746d07f9f105352688cf7a2fa7801cd47e93dce54729bf78c83361e99e0' 
  AND token = 'Xik/xuX1BUiEt0Vd5mX6yecBYJ9U0B5mmw/B6Y39nig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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