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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb664fbaf307ddb1cc46eb4858e1ea64d91c755fa71f81348ec5c1b5036b793d' 
  AND token = 'QNcq5LexuZQoEJUd+OX7tdV2fXcgtsc0idzOIB98q8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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