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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d8e5511e94e3bf969916f59c2eba31502705c70f64c3aa40725f2da8596195' 
  AND token = '92PydvNxMUXAUvrGbt7w9PaUiaemuryuMkD7dpkrNT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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