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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2009c9764bbc289764145a866104c7157eb19e1f770fc9338de25a76d910f971' 
  AND token = 'XPWkiHOfG84r5PEzwOa0b43zTcDB8ajY5DdVsP4tfSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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