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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747e7630bac297040f891c45eb5742c5bf70534748b48ebfed48d24b28f590f1' 
  AND token = 'qIcOKq3yF7gN4yaLzRdqmp4IQhFeUcCEdQ3KWhViFD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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