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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd879b5c7bec3d7d209e3a9371597b7b1554d59f66057e03913caeb8aac7c901a' 
  AND token = 'cHD+WBssWqqoc6kAOR8/yconyROFuYRfPDlTkRuJeMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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