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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b84f595e7abf29d410dd5f3777035385f7c3b9832c2e462b78279e2f533179' 
  AND token = '8mTw4NsgfS01w4JxbFzNESIGWy5JX7e+BzMS61YqvBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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