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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09b3837b940a2def5d8e89fc30656bd4e62d234fb71737236cee0eb9c40fefb' 
  AND token = 'agwxoih3okVJNE7YwZCBJszip2MALUWNEUg5NbHMMLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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