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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197e12bc5d289d48de5d2005278b8fa258944ee35128cb1f6c3f9bf0437f6255' 
  AND token = 'NzLG7tjola9wBR7lYrh5lNUhsUQtLLc0zYFVUYVdy40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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