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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb71b4a342d7ec271f6e30226eda4f7d2b4c16f155c0ac509202b333b2dcf9f' 
  AND token = 'rar10hOfxEpr54iakyZNs/9zbwDk1LhqZW6piHPbmJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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