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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68cb7d5b76ba256f4963ca6b10d48337e15e4283cf04d398597df56c48a3d96' 
  AND token = 'r06Y8Tnr2EzY1L6VXJ8HQkdi/eDvvoinE0drrZZTO0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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