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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ce93cd34c8963b9e5bb8ef9a1d38aa0cbdfe98c8520567836d34b32f50092c' 
  AND token = 'VGcYHWpEm05+DY25qgZYIatz963FsNOK9HgJMkpcF24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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