SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b63d861684473ca6bdadb04e4a631416bff1b599346f9c27e9aeca02b4f53af' 
  AND token = 'qf/PimLD7oMyvCF+IxjTBvQbq11AFkcQrMB2wGBoK/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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