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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d8b90a29dd87924bfde1f0d0850b23eea3fdb9c89f20fb6a5e916138820697' 
  AND token = '4d+IlxUtQfnb3AUCfycBkCHj6+pDBA+ZYn6r2eHpSVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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