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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f12d7ef28885ce6d7e843bb12427bc2e5d742fcfd5b3af51a91ccec07939435' 
  AND token = 'Y92KIj5B+Ln6G9hPfi6C5lm/xNWuHNYW5x5Q0yoPXeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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