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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc71177e403ebfac801717487780de73e3e67499c44d715ba196da8e2bb4333' 
  AND token = 'tsD/gkOYuRl0TnmH2JsFKOsf+mu8bUIej2PWtL4QZIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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