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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f639668e2051634b6d7339ba734b1b9de1e2ead2030ada276d7b186e148495b7' 
  AND token = 'oj4MpDKpKFwq1Uj/WiRfHRjZfszV6uWU8QRJHTV3Te0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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