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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f82f58e9f9c632c5bb69680b60b692c0e08115768848623ff0bf19d7b3b1c9b' 
  AND token = 'ROhILGp3YxnZ5wCtBFNIQ0TtTDCyz8n8Gq1MIAqa7Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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