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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b4a23dab4073ae6f100dc16fd7638dcf902675b731499b96e2eddf65bc97b8' 
  AND token = 'oyPLpBvrGo/io0eLwyU9jvu8lPllw+KByf267o+RhjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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