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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db7d4233de530b1fb31743c7b9286e7f4ed1c6663e5ef3bad9bd57fb8797b83' 
  AND token = 'jOfCqp/O4Br2LTEdG1qHxadYIB+U5o/EFf2yhfiIjbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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