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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896767b18c4217c03738d4008948233f96370a278ad01147222314bd138c954f' 
  AND token = '60SjbqaJc/imvnbTWz0ofeKT0l/jddPm7YH6unazQNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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