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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47d4e1f31a67f617b5ba0c39ec064fb5a1c7ba6956cc088b4b23243b0cd6066' 
  AND token = 'veSNwDsu7P2M3Wm5uuUFWaEldFhfgXnqaWOMmLEKZj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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