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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a159c9d91861b520dc07e75b7ba3f55189cf7464ee0d5a5b4dd13e895c84f544' 
  AND token = 'LlN7LStVwUgmnQzvCUCrkjrGNa862e3LQm9xj9E2AXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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