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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd54da56d68d40564ce1bf06ea918d70c0dbc9f773677f13f568be40dad67610' 
  AND token = '8kYV8AB0KoRati6i17aB85l9N1bc8ONiYrt+p04iUvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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