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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76577acbf9384d81d73c3b4306abfcd338b138d5daff7810b47d638971245d3e' 
  AND token = 'cLA+0eJArwLN7MOvKU+P8sOMlJcjOgu2PIlfRjseY+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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