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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93ec3520ebe2e39db6b4631ffe639c1108192ab6ead95ecfb56f452ce447949' 
  AND token = 'oqeNcJem4E7+1K//TUslOwRMwB7L5IQTvUZmo6aAGuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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