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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e416c1a49fb94d032619d6d2f9e776af3adad8c01526999c4d1daa2bdbfc72' 
  AND token = '1bbKeT69JeOIfKCtArNtZhp6HHE7spk70RWbpQtNs6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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