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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724ccc068503f97d488faef590c3913ed427e30cc563b817a27dff126f5e8adf' 
  AND token = 'zENJnAi6ItUGiKyBW9iZM5gAmdUFe69m9kJLOSZC5/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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