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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3fa2dc7c9ac4f8b3cc382dc99a27f18c7d7f940151d367b7a973dbd7b41c7c' 
  AND token = 'wEB6+D+jxuu5nJiPsF3NVCsM3vcijYiYstDXzSkJfnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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