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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa69a8b003d88b979f8d33dbd60b6c82653c2760a9536266802749405d63adb6' 
  AND token = '+fE/hyLCfL43wNHdPkiXokbcpcAl4KLg1NSq0+QZ1mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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