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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1e0bb6395749dc206c5bd0ee1fb5f11d81d8cc9c01a9b8fa7f0a6fbcdfc890' 
  AND token = 'EX8SMMhDspG9YHpFMk0yvBovFt7G5SlFBpOmYYcsChU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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