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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5741e415e27cd915d7e64c7d8f7fe12ff0911ebb9898cc133ef4af0ce43e18' 
  AND token = 'u0HoP8tPs5kXmFS5QAy9tkihjpIuJsIseH9mUouLZwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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