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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a5a6d1fec8ec7b0e0589d6f8fd4cc802297b1a8267d7cbcc647db1bb3489cc' 
  AND token = 'MnZxHJCZmdl3jgJZAto/9Tj0DY/0WF1+w9P/196dCyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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