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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf3c38433bb4b1a3491338f6cbf799a4bc36525784180396f0b60176652d8e0' 
  AND token = 'Hh0tMdRjxMGdBKjYRmX5b09YmC8PUQA7Qb5gP+i8T2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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