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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4603623805dcde0885b0e629acf5518ae817ef006275120ef65dfc8c3811f178' 
  AND token = 'YSpW0UDhDCb0L3oR6r6cxHL6wRLs4ekPHg8X/gCnz2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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