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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b27090722ace3dc5f0ab3b7a800418d33fdec5eed5f38b2a830730e9405255' 
  AND token = 'ZsvZHRyvKq+lD5jemzDawB7KU7rXwEZtkMXIAllClyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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