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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847498270be175dc33935da1bd50cd476215f58c3472b7503542567daaf7d5bd' 
  AND token = 'tIii1eIKx/YUMyQTDnzd7CFc6QQ3C9KTLAVK3TTp3HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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