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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9862366b1e3aa261d8ef9d86d81531b1eee2d985dcb80c1357646288c28ddfd' 
  AND token = 'zNL/Qd/p1ghNkoQTeaaSijcTj2M7TncingHjz2gqC9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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