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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14de2f70c5a4080642911a6ef87e81354b79c278ec5f1f0fc099a3e632a742b' 
  AND token = 'xpf+/SuKTpa5RLS1EC4IbohFlVd8+FKV4FanJgNkp+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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