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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e82d83466d42f6e70417c57c850cd707df18fe3725be0eb6f6a9f0b59147488' 
  AND token = 'nNOLrVF9kihYMxT8o/OdyZE4tqK7XqheTTaXa9S6Wtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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