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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d03b7bacc53593e800ba199a754316caa07c2429494da92575dc1b97ec4cdc' 
  AND token = 'p/IscUzCoZ4vl3rOMAxbQlzM8XdJCFQ9qjbitP3pOL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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