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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73143187c79dc1bbcb670a151081a5992913e863e361a6eb40109873d1181e0' 
  AND token = 'ADwkCyqJ+Gruc2NocbxN5HYvQb28RhYvaD/EveWjvLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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