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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2491edad4feb45c4574d6d74779fea5960267560eb9f2dffc5fbd0e12d1dd9ee' 
  AND token = 'IC/narZTYW/x03nc09wUMdc9NMAvjhk8MVcrUUeymiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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