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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d6de62396ac3b6bea3a13a729a0e187cd564fb005081cdc3c9725b7302dac0' 
  AND token = '4J9QtNyskhqu1r++oenRw7jO3/NlASpgJSc3tNqvAqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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